Marinara sauce is a tomato sauce usually made with tomatoes, garlic, herbs, and onions. Variations include capers, olives, spices, and a dash of wine. Widely used in Italian-American cuisine, it is known as alla marinara ('sailor's style') in its native Italy, where it is typically made with tomatoes, basil, olive oil, garlic, and oregano, but also sometimes with olives, capers, and salted anchovies. It is used for spaghetti and vermicelli, but also with meat or fish.

Source: Wikipedia